You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure, I am glad to help you with that.

USER: IThank you.

ASSISTANT: Can you please tell me your name?

USER: Check reservation on the name Jacob Thomas.

ASSISTANT: Happy to inform you that, I found your reservation. Can you please share your travelling airport codes?

USER: I would like to prefer these airport codes ATL  and  AUS.

ASSISTANT: On which dates you want me to book your tickets?

USER: I am travelling on these dates April 20th and 22nd.

ASSISTANT: Do you have any specification?

USER: I prefer single connected flight.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok no problem, thank you for your services.

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