You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: My name is Cynthia Robinson. I would like to travel from IAH to New York to surprise my sister by celebrating her birth day. Can you help me in ticket booking on 08/21?

ASSISTANT: Sure, can you help me with your destination and your return date please?

USER: My destination code is JFK and I would like to return on 08/23.

ASSISTANT: Ok, hold on a moment I will get back to you.

USER: Sure.

ASSISTANT: Thanks for holding on, we have not found any flights with your given details.

USER: Ok, no problem.

ASSISTANT: Thanks for contacting us.

USER: Thanks for the information.