You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Donna Lee.

ASSISTANT: How may I amend you today?

USER: I need to book my flight ticket from Houston, HOU to attend my sister baby shower occasion.

ASSISTANT: Ok.

USER: Will you help me in booking me a flight with the fare of 500?

ASSISTANT: Sure, I am here to help you in booking a flight.

USER: Thank you.

ASSISTANT: Will you share your trip dates?

USER: 11/08 - 11/10 are my trip dates.

ASSISTANT: May I know your destination point?

USER: My destination is San Francisco, SFO.

ASSISTANT: Thanks for your details, but no flights run on your route on particular days.

USER: Ok , I will choose other airline.

ASSISTANT: Thank you for choosing us, Have a great day.

USER: Thank you for assisting me.