You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: My name is Pamela Martin. Due to health issues, I want to change my existing reservation. Could you please help me in that?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: We found a reservation with your name. Kindly mention your travel dates.

USER: My travel dates are from 01/19 to 01/21.

ASSISTANT: Can you please help me with your airport codes?

USER: My source airport code is TX - HOU and destination airport code is IL - ORD.

ASSISTANT: There is a flight with your requirement, airline is UA with price 100 and single connection. Shall I proceed with booking?

USER: Please proceed.

ASSISTANT: Your booking is done and flight number is 1001.

USER: Thank you for booking.

ASSISTANT: Thanks for reaching us.