You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to sudden work, I want to change my reservation. Can you please help me with it?

ASSISTANT: Ok, may I know your name ?

USER: Jack Thomas here.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: We found a reservation on your name. Can you share your new airport codes?

USER: My airport codes are from BOS to AUS.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates will be on Mar 25 to Mar 27.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Ok, may I know your airline preference?

USER: I would prefer normal-cost airlines.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Please wait until I check your requirements.

USER: Ok.

ASSISTANT: Sorry, there are no flights found with your requirements.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.