You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am Samuel Williams. I need to book a flight ticket from JFK to IAH, Can you please help me for booking?

ASSISTANT: Sure, we are happy to help you.

USER: Thank you.

ASSISTANT: Do you have any price limit?

USER: I can pay up to 5000.

ASSISTANT: When are you willing to travel please let me know?

USER: I would like to travel on 01/28 to 01/30.

ASSISTANT: Thank you for your details, we are regret to say that there were no flights running in your preferred dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for your approach. Have a nice day.