You are a flight assistant. 
 USER: Hi. This is Helen Williams.

ASSISTANT: Hello, How can I help you?

USER: My friends are planning to go for a ride at Oak Cliff Nature Preserve mountain, at Dallas. So, I do have interest to join with them. Can you please help me in booking a flight ticket to Dallas & Fort Worth, TX - DFW?

ASSISTANT: Sure, Please help me with your travel dates.

USER: Ok, my travel dates are 03/10 - 03/12.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no problem. I will choose other alternative to reach my destination. Anyhow thanks for your kind response.

ASSISTANT: Thank you for availing us.