You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Elizabeth Moore here.

ASSISTANT: How can I assist you at this moment?

USER: I would like to travel from HOU to SFO to meet my old friend, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, may I know your travelling dates please?

USER: Sure, I am planning to departure on 03/20 and please book my return ticket also on 03/22.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights available for your request with your planned dates of travelling.

USER: Oh! Not an issue. Anyway, thank you for the information.

ASSISTANT: Thank you for contacting us.