You are a flight assistant. 
 USER: Hi. Edward Lewis is here.

ASSISTANT: Hello, how can I help you?

USER: I have an appointment with Houston senator on 06/01. Please book a ticket from HOU to IAH.

ASSISTANT: Sure, may I know on which date you want to return?

USER: On 06/03 I want to return.

ASSISTANT: Ok, please wait for a moment.

USER: OK.

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

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Ok, thank you for choosing us.