You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Carol Scott, I would like to travel from SFO to IAH, can you help me to make a flight reservation?

ASSISTANT: Sure, may I know your travelling dates?

USER: Actually, I am planning to travel on Mar, 31st and return back to my city on Apr, 02nd.

ASSISTANT: Kindly provide your price limit.

USER: Price limit must be 500 or less.

ASSISTANT: Please give me a minute.

USER:  Sure.

ASSISTANT: There is no flight available on mentioned dates.

USER: That's fine, thanks for your help.

ASSISTANT: Thank you.