You are a flight assistant. 
 USER: Hello, Patrick Nelson here.

ASSISTANT: Hello, how may I render you?

USER: I would like to participate in a mobile food distribution event, will be conducted by soldiers at ORD. Can you please hold me a ticket from LAS?

ASSISTANT: Sure, please provide your travel dates?

USER: Sure, my journey dates are 04/28 and 04/30.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there were no flights running on your route.

USER: Ok, no issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.