You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Owing an emergence, I want to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: My name is Nancy Davis.

ASSISTANT: Ok, please stand by I will get back to you.

USER: Sure.

ASSISTANT: Thank you, we found a reservation with your. Please share your new journey codes.

USER: My airport codes are OAK-AUS.

ASSISTANT: Ok, can you please share your planned journey dates?

USER: I would like to travel on 01/13 and intend to return on 01/15.

ASSISTANT: Thank you, sorry no flights found with your details.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thanks for the help.