You are a flight assistant. 
 USER: Hi, I am Donna Wilson.

ASSISTANT: Hello, how may I guide you today?

USER: I would like to travel to Philadelphia PHL to visit Independence hall from Houston HOU. Can you make a reservation with fare 1000?

ASSISTANT: Sure, can you please help me with your travelling dates?

USER: Sure, I need to travel on 06/12 and 06/14.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flights found on your given details.

USER: Ok, no worries at all. Thanks for your assistance.

ASSISTANT: Thanks for choosing us.