You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any assistance from us?

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

ASSISTANT: Sure, I will definitely help you. Could you please tell us on which name you reserved your previous ticket?

USER: Sure, please check the reservation with my name Betty Lewis.

ASSISTANT: Ok Lewis, please hold on for a moment. Lewis, I haven't found your reservation in our portal to change further.

USER: Oh! May be booking has not done properly. Anyway, thank you for your time.

ASSISTANT: My pleasure, thank you for opting us.