S1:What is his name? S2:His name is Hanford Loo. S1:What is his date of birth? S2:His date of birth is the 17th of April 1973. S1:Is he married? S2:Yes,he is married. S1:What is the name of his vessel? S2:The name of his vessel is Blue Star. S1:What is his rank? S2:He is the 4th Engineer. Q4:What is not mentioned in the conversation?