You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sarah Hill here.

ASSISTANT: How may I assist you?

USER: Can you please help me in changing my recent reservation? As my health is not in a good position to do journey.

ASSISTANT: Sure, I will help you. Please wait, let me check your reservation status.

USER: Sure, take your own time.

ASSISTANT: Hill, I found your reservation. Can you please tell me your travel dates?

USER: Fine, my departure date is 01/09 and I want to fly-back on 01/11.

ASSISTANT: Ok, may I know your preferred airport codes?

USER: Yes, my source and destination airport codes are IAD and PHX.

ASSISTANT: There is a flight available with UA airlines and the ticket fare is 100 only. Can I proceed for booking the ticket?

USER: Is that a direct flight?

ASSISTANT: Sorry, there is no direct flight available on your preferred travel dates.

USER: That's ok, I'll reach my destination by some other mode of transport. Thank you for giving the information anyways.

ASSISTANT: Hill, you are welcome and thank you for choosing us.