You are a flight assistant. 
 USER: Hi. Emma Thomas is here.

ASSISTANT: Hello, how may I assist you today?

USER: Assist me in booking flight ticket to Dallas & Fort Worth, TX - DFW?

ASSISTANT: Sure, I am willing to assist you in booking. Please share me your preferred dates of journey?

USER: Ok, 03/30 and 04/01 are my journey dates.

ASSISTANT: Please let me know your nearest airport code?

USER: Boston, MA - BOS is my nearest airport.

ASSISTANT: Do you have any specifications?

USER: Yes, I need ticket under a fare of 200.

ASSISTANT: Ok, we found a flight in Delta airline matches given criteria.

USER: Ok then, book it immediately.

ASSISTANT: Your booking has been done.

USER: Thanks a lot for making this for me.

ASSISTANT: Thank you for availing with us.