You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Alexander Lee, want to travel from 08/19 to 08/21.

ASSISTANT: Please help me with your travel codes.

USER: My airport codes are from LAS to PHX.

ASSISTANT: There is a flight with fare 100 in AA airlines. Is it ok for you?

USER: Yes.

ASSISTANT: Your booking is confirmed with flight number 1026.

USER: Thank you.

ASSISTANT: Thank you for contacting us.