You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can I know your concerns?

USER: I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Ok, please provide me your name to check for the reservation in our records.

USER: Thank you. Please check the reservation with my name Thomas Green.

ASSISTANT: Ok, please wait a moment I will check.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, the reservation you have asked for is found and it can be amend. May I know your new airport codes?

USER: Sure, I would like to travel from SFO to EWR.

ASSISTANT: Ok, please can I know your dates which you want the ticket to be amend into?

USER: Sure, I have planned my travel dates as Dec 20 and Dec 22.

ASSISTANT: Ok, please let me know your specifications.

USER: I am looking for single connecting flight so please check with that.

ASSISTANT: Is there any other specifications?

USER: No, I am ok with any airlines to travel.

ASSISTANT: Sorry, there are no flight is available at your locations to change. Thank you for choosing our agency.

USER: Oh! It is sad to hear. Anyway, thank you for your time.