You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself James Phillips.

ASSISTANT: How can I help you?

USER: As my exam is postponed, I want to change my existing reservation. Can you help me?

ASSISTANT: Yes, I can help you with that. I have found reservation on your name.

USER: Ok.

ASSISTANT: Can I know your new travelling dates?

USER: I will travel from PHX and land at CLT. My travelling dates are 07/14 to 07/16.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: I have found a flight ticket for you with a fare of 100 and 1 connecting flight. Can I proceed to booking?

USER: You can book it.

ASSISTANT: Your ticket has been booked with Frontier airlines.

USER: Thank you for helping.

ASSISTANT: Thank you for reaching us.