You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Sharon Roberts. Please book a flight ticket to Denver, DEN on 06/26.

ASSISTANT: Sure, may I know your return date?

USER: I will be return on 06/28.

ASSISTANT: Ok, let me know your boarding point.

USER: I am boarding at Houston, IAH.

ASSISTANT: OK, please wait.

USER: Sure.

ASSISTANT: Thanks for your time, there were no flights found based on your request.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for approaching us.