You are a flight assistant. 
 USER: Hello. I am John Martinez.

ASSISTANT: Hello, how can I help you today?

USER: Please book me a ticket at evening time from HOU to BOS to meet my family.

ASSISTANT: Sure, kindly share you travel dates.

USER: I have planned to travel on 08/11 and 08/13.

ASSISTANT: Can you please help me with your airline preference?

USER: I am ok with any airline.

ASSISTANT: Do you have any connection preference?

USER: I need a direct flight.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for opting us.