You are a flight assistant. 
 USER: Hello. I am Helen Jackson.

ASSISTANT: Hello, how can I render you?

USER: Can you please book a flight ticket from DFW to CLT?

ASSISTANT: Sure, can you please share your planned dates of travel?

USER: Thank you. I have planned to travel on dates of Sept 16 and Sept 18.

ASSISTANT: Is there any class preference?

USER: No, I am ok with any class.

ASSISTANT: Do you have any specifications?

USER: Yes, I would like to return in the morning time.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there were no flights found on your route.

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

ASSISTANT: Thank you for availing us.

USER: Most welcome.