You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Raymond Thompson here.

ASSISTANT: Yes, Raymond Thompson nice to meet you.

USER: I want to go to Houston for a vacation.

ASSISTANT: Sure, may I know your travel details please?

USER: Can you please help me in booking a ticket from OAK to IAH? My travelling dates are from 05/04 to 05/06.

ASSISTANT: Sorry for the inconvenience, there is no flights for you.

USER: That's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your help.