You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I am here to help you with this. May I know your name please?

USER: I am Edward Wilson.

ASSISTANT: Please wait for a mean while.

USER: Sure.

ASSISTANT: There is a reservation found under your name, can you please help me with your dates of journey?

USER: My trip dates are May 20 to May 22.

ASSISTANT: Ok, may I know your respective airport codes of journey?

USER: My source is LAS and landing airport code is HOU.

ASSISTANT: Do you need any other specifications please?

USER: I need a connecting flight.

ASSISTANT: Are you expecting any other specifications please?

USER: No.

ASSISTANT: Ok, please wait for a mean while.

USER: Sure.

ASSISTANT: I found a connecting flight of fare 300 with the Spirit airline, are you ok with this booking?

USER: You can confirm it.

ASSISTANT: Ok, I have reserved your ticket with the flight number 1000.

USER: Thank you.

ASSISTANT: You are welcome, have a safe flight.