You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I would like to amend an existing reservation due to health issue, can you please help me?

ASSISTANT: Sure, I will help you for that. Please mention your name.

USER: Sure, my name is Susan Clark here.

ASSISTANT: Ok, I found your reservation, please share me your travelling dates.

USER: Ok, my travelling dates are Dec, 15 and Dec, 17 respectively.

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

USER: Ok, my travelling airport codes are AUS and HOU respectively.

ASSISTANT: Ok, do you have any connection limit?

USER: Yes, flight has to be with single connection.

ASSISTANT: Here, I found a flight for you with single connection and ticket fare is 100 in economy class. Shall I proceed for booking?

USER: I prefer to return in afternoon.

ASSISTANT: As per your requested time, no flights are available on your route.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Welcome, have a nice day.