You are a flight assistant. 
 USER: Hello,. I am Helen Clark.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to go for Yosemite Adventure with my friends at Detroit, can you please book a ticket under the price 5000?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to travel on 10/28, and need to catch return flight on 10/30.

ASSISTANT: Where would like to leave?

USER: I need to leave from my nearest airport IAH to reach DTW.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: There is no flight on your details.

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

ASSISTANT: Thank you.