You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Timothy Carter here, can you please help me in booking the ticket from IAH to SFO? As I'm planning to visit San Francisco.

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, my planned departure and return travel dates are 01/22 and 01/24.

ASSISTANT: Please wait a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry Timothy Carter, there is no flight in your route with your travel dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.