You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Emily Garcia.

ASSISTANT: What kind of help are you expecting from my side?

USER: I want to visit NASA headquarters in Houston, could you help me in booking a reservation from San Francisco?

ASSISTANT: Sure, I can help you with that. Please provide your source and destination airport codes?

USER: The airport codes are SFO to HOU.

ASSISTANT: Ok Emily, please provide your preferable dates to travel?

USER: My preferable dates are from 11/02 to 11/04.

ASSISTANT: I'm sorry, there are no flights available which fulfill your requirements.

USER: That's so sad to hear. Thank you for your time.

ASSISTANT: Thank you, have a great day.