You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I am Eric Clark from Dallas. I want to go to New York for attending a summit there, can you please book a flight ticket from DFW to LGA?

ASSISTANT: Sure, I am glad to assist you with that.

USER: Thank you.

ASSISTANT: Can you please provide your planned date of travelling?

USER: I want to take off on 06/29 and confirm my return ticket also on 07/01.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Oh! It's ok no problem, I will go with another airline.

ASSISTANT: Thank you for using our services, have a great day.

USER: Thank you for your information.

ASSISTANT: Welcome.