You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Martin.

ASSISTANT: Charles, how may I assist you today?

USER: I would like to spend my free time with my family members in New York city, will you please help me to get flight ticket?

ASSISTANT: Sure, provide me your journey dates.

USER: Sure, my travel dates are 02/11 and 02/13.

ASSISTANT: Ok, may I know your airport codes?

USER: I would like to travel from IAH and JFK.

ASSISTANT: Charles, give me a moment.

USER: Sure, take your time.

ASSISTANT: Charles, sorry to inform you that there is no flight available at your requested dates.

USER: Oh! It is sad to hear. Anyway, thank you for your valuable time.

ASSISTANT: You are welcome. Thank you form reaching us.