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

ASSISTANT: Hello, how can I assist you today?

USER: I need to visit Houston to enjoy Yosemite adventure with friends on 05/05. Can you make a direct flight reservation?

ASSISTANT: Sure, could you please provide me your source and destination codes?

USER: Sure, I am leaving from New York JFK to HOU.

ASSISTANT: May I know your return journey date?

USER: Sure, I intend to return on 05/07.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given journey details.

USER: Ok, not an issue. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.