You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Ok, may I know your name?

USER: Myself Michael Collins.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Ok, I found your recent reservation. Can you please tell me your travelling dates?

USER: My travel dates are 01/15 and 01/17.

ASSISTANT: Can you please mention your travelling airport codes?

USER: My airport codes are from ORD to HOU.

ASSISTANT: Here is a flight ticket with fare 100 and connection limit is 1 and UA as airline. Shall I proceed to change your reservation?

USER: You can book it.

ASSISTANT: Ok, your ticket is changed to other airline.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.