You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Frank Perez here.

ASSISTANT: How can I assist you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure Perez, please wait a moment.

USER: Ok.

ASSISTANT: I found your reservation, can you please let me know your travel dates?

USER: Ok. My travelling dates for journey are 08/18 to 08/20.

ASSISTANT: Could you please provide the airport codes?

USER: My airport codes for boarding the flight are IAH to ATL.

ASSISTANT: Ok, wait a moment please.

USER: Sure. I need a direct flight.

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

USER: Ok, not a problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you.