You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Gary Roberts. I wish to visit my cousin residing at Houston. Please help me by booking a flight ticket.

ASSISTANT: Sure, do you prefer either an economy or business class?

USER: I am good with any class.

ASSISTANT:  May I know the genesis and terminus airport codes?

USER: My journey starts from SFO and HOU.

ASSISTANT:  Please provide me your planned travel dates to proceed.

USER: August 24 and 26 are my planned journey dates.

ASSISTANT: Kindly let me know if you have any other preferences.

USER: I prefer to depart and return at afternoon in a direct flight.

ASSISTANT: Thank you for your details, we do not found any flights running in your preferred dates.

USER: That's ok. Thanks for trying to help me.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.