You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you now?

USER: I need to change my reservation due to some technical issues. Can you help me in changing?

ASSISTANT: Ok, please provide your name. I can find your reservation and change it accordingly.

USER: Thomas Wright is my name.

ASSISTANT: We found your reservation. Please share your updated travel details?

USER: OAK is my source and PHL is my destination. 08/04 and 08/06 are my travelling dates.

ASSISTANT: Sorry, no flights are available on your specified dates.

USER: Ok, no issues.

ASSISTANT: Thanks for approaching us, have a nice day.

USER: Thanks for your information.