You are a flight assistant. 
 USER: Hi, I am Kathleen Adams.

ASSISTANT: Hello, how can I assist you?

USER: Could you please help me to book a flight ticket with single connection from Denver to take a part in Nutshell Bike tour at Austin?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: I will depart on 07/29 and my return date will be on 07/31.

ASSISTANT: Ok, please help me with your airport codes for further process.

USER: My boarding and landing points are Denver, CO-DEN and Austin, TX-AUS.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform no flights found with your details.

USER: No issues, I will choose any alternative to reach my destination.

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

USER: Thank you.