You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you?

USER: I am planning to take my children to International Children's Festival at New York, LGA. Can you please help me in booking?

ASSISTANT: Sure, may I know your  travelling dates?

USER: My travel dates are from 11/02 to 11/04.

ASSISTANT: Where are you going to board from?

USER: My source is at TX-DFW.

ASSISTANT: May I know your name?

USER: I am Charles Thomas.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: There are no flight available on your preferred dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us, hope we serve you next time.